Module decoder 

Field decoding traits for XRPL transaction and ledger object fields.

This module defines a lightweight, host-independent decoding contract for types that are constructed directly from a raw byte buffer.

Examples

use xrpl_wasm_stdlib::fields::decoder::{FieldDecoder, FromCurrentTx};
use xrpl_wasm_stdlib::host::Error;

/// A toy field: a single boolean flag byte (0 or 1).
struct Flag(bool);

impl FieldDecoder for Flag {
    type Buffer = [u8; 1];

    fn decode(bytes: &[u8]) -> Result<Self, Error> {
        match bytes {
            [0] => Ok(Flag(false)),
            [1] => Ok(Flag(true)),
            _ => Err(Error::InvalidDecoding),
        }
    }
}

// Declares that `Flag` can be decoded from the currently executing transaction.
// `FromLedger` is implemented the same way for fields readable from ledger objects.
impl FromCurrentTx for Flag {}

let flag = Flag::decode(&[1]).unwrap();
assert!(flag.0);

assert!(Flag::decode(&[2]).is_err());

Traits

FieldDecoder

Decodes a fixed-format XRPL field from its raw byte representation.

FromCurrentTx

Marker trait for fields that can be decoded from the currently executing transaction.

FromLedger

Marker trait for fields that can be decoded from a ledger object.